3.2.1. DVB demux open()

3.2.1.1. Name

DVB demux open()

3.2.1.2. Synopsis

int open(const char *deviceName, int flags)

3.2.1.3. Arguments

name

Name of specific DVB demux device.

flags

A bit-wise OR of the following flags:

O_RDONLY	read-only access
O_RDWR	read/write access
O_NONBLOCK	open in non-blocking mode (blocking mode is the default)

3.2.1.4. Description

This system call, used with a device name of /dev/dvb/adapter0/demux0, allocates a new filter and returns a handle which can be used for subsequent control of that filter. This call has to be made for each filter to be used, i.e. every returned file descriptor is a reference to a single filter. /dev/dvb/adapter0/dvr0 is a logical device to be used for retrieving Transport Streams for digital video recording. When reading from this device a transport stream containing the packets from all PES filters set in the corresponding demux device (/dev/dvb/adapter0/demux0) having the output set to DMX_OUT_TS_TAP. A recorded Transport Stream is replayed by writing to this device.

The significance of blocking or non-blocking mode is described in the documentation for functions where there is a difference. It does not affect the semantics of the open() call itself. A device opened in blocking mode can later be put into non-blocking mode (and vice versa) using the F_SETFL command of the fcntl system call.

3.2.1.5. Return Value

ENODEV	Device driver not loaded/available.
EINVAL	Invalid argument.
EMFILE	“Too many open files”, i.e. no more filters available.
ENOMEM	The driver failed to allocate enough memory.